Electromagnetic shuttle protector system for looms



June 12; 1951 ABBOTT 2,556,785

ELECTROMAGNETIC SHUTTLE PROTECTOR SYSTEM FOR Locus Filed June 2, i948 :s Sheets-Sheet 1 IN V EN TOR.

m d/b5444 gall; .ATToR/VEYS June 12-, 1951 A R, ABBOTT I 2,556,785

ELECTROMAGNETIQ SHUTTLE PROTECTOR SYSTEM FOR LOOMS Filed Jung 2, 1948 3 Sheets-Sheet 2 asvcnsc "START [2] uvmvrox,

BY 3 E h ATTORNEYS June 12,1951 R ABBOTT ELECTROMAGNETIC SHUTTLE PROTECTOR SYSTEM FOR LOOMS Filed Jun 2, 1948 s Sheets-Sheet :s

IN V EN TOR.

Patented June 12, 1951 ELECTROMAGNETIC SHUTTLE PROTECTOR SYSTEM FOR LOOMS Arthur R. Abbott, Shelton, Conn., assignor to Sidney Blumenthal & (30., Inc., New 'York, N. Y., a corporation of New York Application June 2, 1948, Serial No. 30,663

20 Claims. 1

This inventionrelates to looms and, more particularly, to electro-magnetica-llyactuated means for preventing injury to -a shuttle and/or the yarn being Woven in case of failure of the shuttle properly to traverse the sheds and enter its box, and has for-an object to provide a construction and arrangement in which such a shuttle fail ure will automatically bring into operation electronic control means that will-stop the loom and actuate mechanism which obstructs the 7 forward motion of-thelay'so as to prevent injury to the shuttle and/or yarn.

Anotherobject is to provide such a systemwhich simplifies loomconstruction by eliminating the usual movable daggers and mechanism for liftingthem on each forward stroke of the lay while the loom is operating correctly.

Another object is to provide such a systemdn which the parts are normally set to stop the loom at the termination of each shuttle-flight and in which such action is prevented by a magnetic element carried bythe shuttle crshuttles which becomes effective upon proper entry of each shuttle into its box.

Another object is to provide such a system which operateswithout the necessity of the employment of highvolta'ges in connection withthe shuttle boxes, thus minimizing the danger I of injury through fire.

Another object is to provide such a system in which thefitting of the magnetic element in the shuttle does notcall for change in general construction, form or size of the shuttle.

Another object is toprovide such a system in which is adapted to be applied to looms of standard and approved types without the requirement of any substantial changein their construction or mode of operation.

A further object is to provide certain improvements in the formyconstruction and arrangement of the parts whereby the above named and" other objects inherent in the invention may be effectively attained.-

A practical embodiment of theinvention shown in the accompanying drawings, in which: Fig. 1 represents, partly diagrammatically, a side elevation, partly in section, of a loom lay leg and'associated parts; the leg and its actuating'pitmanbeing shown in two positions in full and broken lines;

Fig; 2 represents, a similar view showing in detail certain of the parts 'in" position differentfrom those-of Fig;-l;

represents a diagrammatic layout Of'tllf) electronic control and certainoperativemechan ical parts associated therewith, adapted to be used in connection with a double shuttle pile or plush loom;

Fig. 4 representsa top plan view of an upper shuttle for a double shuttle loom equipped with the above mentioned magnetic element.

Fig. 5 represents a similar view of a lower shuttle;

Fig. 6 represents a broken front elevation of of the shuttle boxes of a double shuttle loom mounted on the lay, with the front elements of the boxes removed;

Fig. '7 represents a broken top plan view of a shuttle box and associated picking mechanism; the box being shown as equipped with an electric element for cooperating with the magnetic element carried by the shuttle, and a portion of a shuttle being shown as entering the box; and

Fig. 8 represents a side elevation of the parts shown in Fig. 7.

It has been common practice in loom construction to provide means for stopping the loom in the event a shuttle fails properly to enter its box, in order to prevent injury to the shuttle and/or yarn being woven through the striking of the former by the lay. This means has usually included one or more movable daggers carried by the lay in position to contact one or more blocks fixed to the loom frame, which contact serves to stop the loom by what is commonly referred to as a bang ofi. To avoid this stoppage while the loom is operating satisfactorily and the shuttles are properly entering their boxes, mechanism, generally including bell cranks and rods, has been associated with the back of one or more shuttle boxes, which mechanism lifts the dagger or daggers on each forward or beat up stroke of the lay when the shuttles are properly entering their boxes. It will be clear that the arrangement just described necessarily entails z certain amount of complication in loom structure and need for additional power in operation as well as increasing the probability of failure or faulty operation due to the increase in number of moving parts. The present invention is calculated to overcome these existing disadvantages by eliminating the necessity for movable daggers and mechanism for moving them, where'- by there is obtained a substantial advance in loom construction and operation, including the hereinabcve recited objects of this invention.

Referring to the accompanying drawings, one of the lay legs is denoted by l and it is mounted as usualon a rock shaft 2 which has journals (not shown) in the lower part of the loom frame and is arranged to be oscillated by a pitman 3, which is pinned to the lay leg at 4 and. to a crank 5 at 5, which crank is rotated by a motor gear I that meshes with a gear 8 which is fixed to the crank.

Fastened to and projecting laterally from the forward side of the leg is a fixed dagger 9 that is positioned to enter an opening or window l0, which is formed in a small dagger stop casing II that is secured in any suitable manner, as by bolts (not shown), to an adjacent side member l2 of the loom frame.

The construction of the said casin and its movable elements are set forth in detail and claimed in a pending application filed by Francis J. Sullivan and myself on June 2, 1948, under Serial Number 30,544, now Patent No. 2,499,887, and hence the same will be described herein only to the extent necessary for an understanding of the present invention The casing is preferably rectangular in cross section and provided across its front portion with a slideway !3 in which is mounted a slidable shutter [4 that is of such size as to be fitted to close the window l6 (see Fig. 2). A depending tail piece I5 is secured to the lower part of the shutter and also, as indicated at 16, to the core of a solenoid ll, which latter is suitably mounted in the lower part of the casing ll. When the solenoid ll is not energized, the shutter and its tail piece will drop to the position shown in Fig. which leaves the window l0 open, but when the solenoid is energized it will lift the shutter as shown in Fig. 2, causing the latter to close the window 10 and obstruct the passage of vthe dagger 9 therethrough. If desired, the slideway It may be provided with one or more steps (not shown) in position to be contacted by the lower part of the shutter I4 when it is in the position shown in Fig. l in order to prevent its further downward movement. In practice the construction just described is provided at each side of the loom.

The crank shaft of the loom is denoted by l8, and to it are fixed, as by pins or keys, two cams, one of which is marked [9 and the other 26; cam 89 being provided with a raised portion 2|, which extends about half way round the cam, and cam 26 being provided with a radially projecting nose 22. A switch actuator 23 is slidably mounted in a bearing 24 that is fixed in the loom frame in any suitable manner in line with the raised portion 2! of cam l9, and the end of the said actuator extending toward the said cam carries a cam roller 25 which is arranged to travel on the said raised portion 2!. A spring switch contact 26 has one end fixed at 2'! in a suitable part of the loom frame or a support carried thereby and the said spring switch is normally urged against the actuator 23 so as to hold the cam roller 25 in contact with cam IS. A second switch contact 26, which is preferably stationary, has one end similarly fixed at 29, and the said contact 28 is in position to be closed with contact 26 when the latter is moved toward it.

Another switch actuator 36 is slidably mounted in a bearing 3! which is arranged in the loom frame in line with cam 26, and the end of the actuator extending toward the cam carries a roller 32 that is designed to travel on the periphery of the said cam. Another spring switch contact 33 has one end fixed at 34 in a suitable part of the loom frame or an element carried thereby and the said contact is normally urged against actuator so as to hold roller 32 against cam 26. A further switch contact 35, which is preferably stationary, like contact 28, has one end mounted at 35 in any suitable way in the loom frame or part carried thereby, and is in position to mate with contact 33.

Turning now to the diagrammatic layout of Fig. 3, switch contact 26, which is governed by cam i9, is connected by wire 31 with a source of direct electric current 36, which may be of a strength of two hundred volts; while contact 28 is connected by a wire 39 at 4-6 with a pair of resistors M, 62, each of which may have a capacity of twenty-five thousand ohms. Resistor M is connected by a wire 43 with the plate of an electron tube 46, which is illustrated as a shieldgrid thyratron tetrode with indirectly heated cathode, and by a wire 45 with a pair of rd-- sistors 46, Al, each of which may be of six hundred thousand ohms capacity. Resistor 41 is, in turn, connected by a wire 46 with one end of resistor 42 and with the plate of second electron-v tube 49 which is similar in type to tube 44.

Resistors 45 and 41 are connected by a wire 56 with switch contact 33 that is governed by cam 20; while contact 35, which mates with contact 33, is connected by a wire 5| with a resistor 52 that may be of one hundred thousand ohms capacity and is, in turn, connected by wire 53 with a source of bias supply 54 that may be of fifteen volts strength. The said source of bias supply is connected through a pair of in series normally closed push button switches 55, 55, one of which is labeled star and the other reverse, with a wire 56 that leads to one end of the pick-up coil 51 of the iron core type that may be of four thousand ohms capacity and is mounted in the lower left hand shuttle box. Said coil has its other end connected with a similar coil 58 that is mounted in the lower right hand shuttle box. Coil 51 is also connected by a wire 59 with a resistor 66 that may be of one million ohms capacity and is grounded at 6|; while coil 58 is connected by wire 62 with a resistor 63 that may be of one hundred thousand ohms capacity and is, in turn, connected by a wire 64 with the control grid of tube 46. Wire 56 also extends to a pick-up coil 65 that is carried by the upper left hand shuttle box and is connected with another coil 66, which is carried by the upper right hand shuttle box, said coils 65 and 66 being similar to coils 5'! and 58, and coil 65 being connected by wire 61 with a resistor 68 which may be of one hundred thousand ohms capacity and is connected by a wire 59 with the control grid of tube 44. The shield grid of tube 44 is connected by a wire H1 with ground at H, and the shield grid of tube 49 is connected by a wire 72 with ground at 13.

Switch contact 35 is also connected through resistor 74, which may be of one hundred thousand ohms capacity, with the control grid of an electron tube 15, which is illustrated as of a type similar to tubes 44 and 49; while the shield grid of the said tube is connected by a wire 16 with ground at H. A wire 18 extends from the plate of tube 15 to relay 19, which is also connected by a wire 86 with wire 39.

Associated with the relay [9 is a control switch Bl that cooperates with contacts 82 and 83; and contact 82 is connected by wires 84, 85, with two solenoids ll, H, which are located in casings H, as described in connection with the showing of Figs. 1 and 2; said solenoids being in turn connected by wires 66, 81, with one terminal 86, of a source of alternating electric current that may be of two hundred twenty volts strength. Switch BI is connectedby'a wire891with -the otheri termi na1:190 'of;the said: cunentisourc'e s whileicontactr 83-isconnectedsbya wire '9 I'Iwithithemotor;hold-t ingcoil indicated atiS 21 Figs; 4 :to: 8 ofrz'the-zidrawingsiishowfthe shuttle i:

and: shuttle i'box .arrangement-whereby the tivity'. of fithe pickt-up cells 51,- Sin- 65" and ifit s governed by .the proper entr y'zoflthe shuttles into their boxes or their failure to do so.

An upper shuttle is denoted generally by 93 and a lower shuttle :by 94; They'may be of--any standard or approved form or type, except that I a magnet'95, havingra northpole QG 'and-a south pole 91, is suitablyifixed in each'shuttle; the on'e in the upper shuttle beingexposed at the topandthe one inthe lower shuttle beingexposed-at the bottomthereof, as indicated byv dotted line's in- Fig. 5, with the axes of their poles-substantially parallel with the longitudinal axes of the shuttles.

A shuttle 'box, which'may be' of any appropriate construction, is marked 98'andhas1the :usual-slot 99 in its'back wall within which the'picker stick I00 carrying the picker-IN 'reciprocates, as well as an adjustable shuttle guide I 02 and anadjust-- able shuttle brake I03; As previously'menti'oned I.

in describing the showingof :Fig; 3, each shuttle box is provided with-a pick-up coil: and, for' present purposes, it may be assumed'th'at. the shuttle box shown in FigSZ-7 andw8 is the one positioned at the. upper left handside'ofthe loom, so that its coil is denoted by. 65, which was the reference numeral applied. to the coil rcarriedby the'said box in the disclosure -.ofiFig;'3.- The saidlcoi'l 65 is mountedin a bracketil04-that is suitably fastened to-the top of the backoiwthe' shuttle box;

the coil being at such a height as to permit the shuttle and picker to-pass ethereunder with a small clearance and the location ofthe coil with P respect to the width of the box being such that it will be substantially in -vertical alignment with the magnet 95 carried by the shuttle when the shuttle enters the box, .so that the passage'of the magnet carried by the shuttle beneath the-coil,

with the poles'of the magnet successively'coming into reactive range therewith, will generate an electric pulseof substantial strengthandactivate the coil to'cause it tofuncti'o'n as will be hereinafter described." It-will be understood, oficourse;

that a loom of the double shuttle 'or pile type will have'four shuttle boxes provided with coils like the one just described,as'hasbeen indicated in the description of the showing of'Fig. 3 and as from a source of directcurre nt 38 0f twohundred volts strength, is timeditocloseimmediatelyaiter 1 picker stick: I00 has started shuttle -93-on'-its flight and-while the lay mechanismis at'the end of its rearward stroke, "as :shown in broken lines in Fig-l. If the loom shuttles are operating cor rectly so as properly to enter their boxes; the pas sage of their magnets past the box coils' Willgenerate sharp positive electric pulses in: the latter which will overcome the negativetgrid bias athat is being fed through the coilsfrom -the source 54. This will firetubesand dfl-andtcause a drop in their plate potentials from plus two hundred volts, derived from current' source 38, *to? approximately: plus '10 'voltS,=with-= a correspond ing voltage existin'g atthe junction A of wire-50 with resistors and-'41, at thejunction Bof' wire 45 with resistor'flfi an'd at-the'junction C of 11 wire 48 withresistor 4I. The switch composed of" thecontacts' 33 and 35, which is' governed' by'cam 20, is timed to close when the lay mechanism is on its' forward stroke and the fixed dagg'er' a, and its m'ate at-the' opposite 'sideof the m; are" a short distance (e: gr-about one' inch fro'm the" window I 0 in casingi'l I and-its mate at the opposit'e side of th'e loom': This closing of 'switcl'i contacts 33 ,-'35'; will connect junction A with the" control gri'd -of-" tube I5, which is fed by the biassupply from source- 54" througli on'e hundred thousand ohms 'resistor I-I and, as -juncti'on 'A has at that time a plus ten volts potential which fed to it throughthe six hundred thousand ohms resistors and 4T, connectior'ibf A to the control grid of tube' I5 will reduce thegrid bias ofthe said tube to min'usten volts, which is not" sufiic'ient to fire'i th'e said. tube' that -requiresa minus fo'ur volts potentialto fire it. Conse quently; the relay I9 willnotbe'ener'gized-by'tube 15; the 'control switch 8! associated therewith will remain closedwith' contact 83'-so-thatthe motor will-continue inoperation the Y solenoids 61, I! will not be=energized-,and the-shutter I4, and its mate-at theopposite side of the -lo'om, will not lie-elevated --to' close-th"e-window -I0 and its mate at the opposite sideof-the' loom' so" that the dagger 9, and-its'inate at the-opposite side of the loom, can" freely enter the said wi-ndows, thus permitting-a full-forward stroke of-the -lay-mechanism; At the moment the laymechanismreaches; the limit of 'its'iorward- 'stroke, *ca-ms "I 9' and '20 permit their I switch contact's*-toopen; and the tubes 44 49' and [5, togetherwith the circuits andelements associated therewith, are reset tothe 'conditionwhibh existed beforeswitch 26, 285 was closed by cam! 9as mentione'datthe outset ofthis description of the operation."

Suppose,- now, that both shuttles fail properly to enter their boxes: In this 'condition'the pick up coils carried'bythe boXes will not receive e1ec-' tric'pulses due to the passage of" the shuttle mag nets thereby and the tubesM' and iilwill not be fired asheretofore describedin connection with the proper entry ofboth' shuttles into their boxes". Consequently, junctionsA, 'B and C willremain at'a potential-of plus tWo 'hundred'volts, which is sufiicient to overcome'the minusfifteenvo'lts' bias supply being fed'to tube I5 'from'source 54" when contact is made between 'said junctions A, B and C andtube I5 by the closing of switch" contacts 33, 35? This will fire tube I5, energize relay I9, move switchBI' from'contact 83to con tact 82; thus opening the holding motor contact coil circuit to stop the motorgand energize solenoids I1, 'II; which Seleva'te shutter I I and its mate to closeth'e window"'i0 and its mate, arrest" forward'movement of thedaggerfi and its mate by contact with the shutters and thus prevent the ,lay from completing its iorwardmovement and injuring the faultyshuttles and/or the yarn being'woven.

Thesame result will obtain if'either shuttle fails properly to enter its-box, because the fai1- -ure of a shuttle to energizeco-il 6501* (if-Will leave to overcome the I minus I fifteen volts grid bias of tube 15, the latter will be fired with the effect already described. Likewise, the failure of a shuttle to energize coil 51 or 58 will leave tube 49 unfired and junction A will have a potential of plus ninety-five volts, junction B plus two hundred volts and junction C plus ten volts; with the potential at junction A again operating in the same way.

It should be noted that, as is well understood by those skilled in this industry and as is illustrated in Fig. 6, which shows four shuttle boxes 98, H15, H16 and H57, carried by lay I08, one shuttle box of a pair on the same level is generally much longer than the opposite one so that, when upper shuttle 93 is sent on its return flight from box 98, it will enter the longer box I at the opposite side of the loom and its magnet 95 will pass under the coil 66 carried by the longer box to energize said coil in spite of the fact that the magnet is mounted at the end of the shuttle which is last to enter said longer box. This is further assured by mounting the coil 66 near the inner end of boX I05. The same is true with respect to the lower boxes I06, I01, except that the positions of the long and short boxes are reversed and the coils 51 and 58 are mounted at the bottom of the boxes so that the shuttle 94 with its magnet 95 exposed on its under surface rides over the said coils to energize them.

The push button switches 55, 55, are provided for the purpose of re-starting the loom and resetting the control system following a stoppage due to shuttle failure. The switch marked start is connected in any well known or approved manner (not shown) to the current supply for the loom motor so that, when its button is pressed, three phase power is applied to cause the loom to be driven in the forward or normal direction; while the switch marked reverse is so connected to the said current supply that, when its button is pressed, two phases are interchanged and the motor is reversed to drive the 100m backwardly. Additionally, the pressing of the button of either switch 55 will cause tubes 44 and 49 to fire by cutting off their bias supply from source 54. As the shuttles are motionless at the beginning of loom operation, they will not energize the shuttle box coils and there would be an immediate stoppage of the loom following its start. This is prevented by the functioning of the start switch 55 which cuts off the bias supply to tubes 44 and 49. A similar situation arises following loom stoppage or bang off due to shuttle failure as hereinbefore described; and this situation is remedied by pressing the button of reverse switch 55 which has the same effect on the system as pressing the button of start switch 55. Furthermore, the operation of either switch 55 will open switch 26, 28 and extinguish tube 15 by cutting the current from source 38; thereby deenergizing relay 19 and solenoids ll, I1, which permits the shutter to drop and allows full lay motion. Thus the operator, by manipulating the switches 55, 55, can assure proper starting and re-starting of the loom and proper setting and re-setting of the control system.

From the foregoing description it will be seen that the invention accomplishes the objects hereinabove recited, as well as others inherent in it; and that it is applicable to standard and well known types of looms without requiring any fundamental change in the construction or arrangement of their parts although permitting simplification by the elimination of certain auxiliary parts, especially those related to actuation of movable daggers. It will also be evident that the invention is susceptible to variations in its embodiment and that changes may be resorted to in the form, construction, material and arrangement of the parts without departing from the spirit or scope of the invention. Hence, I do not intend to be limited to details herein shown or described except as they may be included in the claims or be required by disclosures of the prior art.

What I claim is:

1. A loom comprising, a frame, a shuttle box at each side thereof, a picking mechanism for driving a shuttle to and from the boxes, lay mechanism, and electronic means for stopping the loom and arresting the lay mechanism when the lay has partly completed a forward stroke, said electronic means being controlled by cooperative electric and magnetic elements.

2. A loom comprising, a frame, a shuttle box at each side thereof, picking mechanism for driving a shuttle to and from the boxes, lay mechanism, and electronic means for stopping the loom and arresting the lay mechanism when the lay has partly completed a forward stroke, said electronic means being controlled by cooperative electric and magnetic elements carried by the shuttle boxes and the shuttle operating in connection therewith.

3. In a loom, means for stopping the loom and arresting the forward lay motion when a shuttle fails properly to enter its box, said means including an element carried by a shuttle box and an element carried by a shuttle, one of said elements being electric and the other magnetic, the one being subject to energization when in proximity to the other.

4. In a loom, means for stopping the loom and arresting the forward lay motion when a shuttle fails properly to enter its box, said means including an element carried by a shuttle box and an element carried by a shuttle, one of said elements being electric and the other magnetic, said electric element being subject to energization when in proximity to said magnetic element.

5. In a loom, means for stopping the loom and arresting the forward lay motion when a shuttle fails properly to enter its box, said means including an electric element carried by a shuttle box and a magnetic element carried by a shuttle, said electric element being subject to energization by said magnetic element when the shuttle enters the box.

6. In a loom, means for stopping the loom and arresting the forward lay motion when a shuttle fails properly to enter its box, said means including a pick-up coil carried by a shuttle box and a magnet carried by a shuttle, said coil being subject to energization by said magnet when the shuttle enters the box.

'7. In a loom, means for stopping the loom and arresting the forward lay motion when a shuttle fails properly to enter its box, said means including a pick-up coil carried by a shuttle box and a magnet carried by a shuttle with the axes of the poles of the magnet substantially parallel to the longitudinal axis of the shuttle, said coil being subject to energization by said magnet when the poles of the latter sequentially pass the coil as the shuttle enters the box.

8. In a loom, means for stopping the loom and arresting the forward lay motion when a shuttle fails properly to enter its box, said means including an element carried by a shuttle box and an element carried by a shuttle, one of said elements '=being electric and the other magnetic, the one 7 beingsubject to energization when in proximity to the-other, anelectricmotor for-operating the loom,'a control switch for 'themotor-current, a movable layarresting device, and anelectronic system arranged -to activate saidcontrolswitch and arrestingidevice, said system being governed by the said element which is-subject to energ-ization.

9. In a loom, means for'stopping theloom and arresting the forwardlaymotion-when a'shuttle failsproperly to enter its box, said means including an-element carried by a shuttle box and an element carried by a shuttle, one-of said elements being electric and the other -magnetic,-'the one being subject to energization when in proximity -tothe other, an electric motor for operating-the loom, a-control-switch for the motorcurrent,- a

movable lay arresting device, and anelectronic system arranged to activatesaid control switch and'arresting device,- said system being governed bythe said electric element.

I 10. In aloom, means for stopping the loom and arresting the forward-lay-motionwhen a shuttle fails properly to enter itsbox, said means including an electric elementcarried by a shuttle box and a magnetic element carried by a shuttle,

said electric element being subject toenergization by said magnetic element when the-shuttle enters the-box, an electric'motor 'foroperating the loom, a control-switch for the motorcurrent, a

movable layarresting device, and an electronic system arranged to activate-said control switch and arresting device, said system being governed and an element carried .by a: shuttle, one :-.of,said

elements being electric anditheother magnetic, the onezwbeing subject toenergization when in proximity to the other, an electric motor for operating the loom, a control switch for the-motor current, amovable-lay arresting; device, and an electronic system-arrangedto activate said control-switch and-arresting device, said system embodying an-electron--tubein operative association with the shuttle box and arranged to be fired when said element that is subject to energization is energized.

, 12. In a loom, means for stopping the loom and arresting the forward lay motion when a shuttle fails properly to enter its box, said means including an element carried by a shuttle box and an element carried by a shuttle, one of said ele ments being electric and the other magnetic, the one being subject to energization when in proximity to the other, an electric motor for operating the loom, a control switch for the motor current, a movable lay arresting device, and an electronic system arranged to activate said control switch and arresting device, said system embodying an electron tube in operative association with the shuttle box and arranged to be fired when said element that is subject to energization is ener gized, and an additional electron tube in operative association with said control switch and arresting device, said additional tube being arranged to be fired when the other tube fails to be fired.

13. In a loom, means for stopping the loom and arresting the forward lay motion when a shuttle fails properly to enter its box, said means including a kind of element carried by each shuttle box and another kind of element carried by the 10 shuttle which operates -in land out of the boxes, one-kind of said-elementsbeing electric and the other kind-magneti the one kind being subject to energization when in proximityto-the other, an electric motor foroperating the loom, a control switch for the motor current, a movable-lay arresting-device, and an electronic -system ar- -ranged to activate saidcontrol switch" and ar-- resting device, said system embodying-an-electron tube in operative associationwitheach shuttle box and arranged to be fired-when asaid *element that is subject to energization is-=energiz'ed-and an additional electron tubeinoperative association with said control switch-and arresting device, said additional tube being arranged to be-fired when either of theother tubes fails to befired.

14. In a loom, means 'for stopping the loom'and arresting the forward lay motionwhen a shuttle fails properly to enter itsbox, saidmeans-including an electric element carried byeachshuttle box and a magnetic element carried by the shuttle which operates inand out of theboxes, each said electric element being subjectto-energization by said magnetic element whenthe shuttle enters its box, an electric motor for operating the loom, a control switch for the-motor current, a movable lay arresting device, and-an electronic system arranged to activate said control switch and arresting device, said system embodying an electron tube in operative association with each said electric element carried by the shuttle boxes and arranged to be fired when said electric element is energized, and anadditional electron tube inoperative associationJwith said control switch and arresting device, said additional tube being arranged to be'fired when either .for operating the. loom, a control switch .for'the motor current, a movable lay arresting device, and an electronic system arranged to activate said control switch and arresting device, said system embodying an electron tube in operative association with each said coil carried by the shuttle boxes and arranged to be fired when said coil is energized, and an additional electron tube in operative association with said control switch and arresting device, said additional tube being arranged to be fired when either of the other tubes fails to be fired.

16. In a loom, means for stopping the loom and arresting the forward lay motion when a shuttle fails properly to enter its box, said means including an element carried by a shuttle box and an element carried by a shuttle, one of said elements being electric and the other magnetic, the one being subject to energization when in proximity to the other, an electric motor for operating the loom, a control switch for the motor current, a movable lay arresting device, and an electronic system arranged to activate said control switch and arresting device, said system embodying an electron tube in operative association with the shuttle box and arranged to be fired when said element that is subject to energization is energized, an additional electron tube in operative association with said control 11 switch and arresting device, said additional tube being arranged to be fired when the other tube fails to be fired, and means for resetting the said system following loom stoppage by extinguishing said additional tube and firing said first named tube.

17. In a loom, means for stopping the loom and arresting the forward lay motion when a shuttle fails properly to enter its box, said means including a kind of element carried by each shuttle box and another kind of element carried by the shuttle which operates in and out of the boxes, one kind of said elements being electric and the other kind magnetic, the one kind being subject to energization when in proximity to the other, an electric motor for operating the loom, a control switch for the motor current, a movable lay arresting device, and an electronic system arranged to activate said control switch and arresting device, said system embodying an electron tube in operative association with each shuttle box and arranged to be fired when a said element that is subject to energization is energized, an additional electron tube in operative association with said control switch and arresting device, said additional tube being arranged to be fired when either of the other tubes fails to be fired, and means for resetting the said system following loom stoppage by extinguishing said additional tube and firing said first named tubes.

18. In a loom, means for stopping the loom and arresting the forward lay motion when a shuttle fails properly to enter its box, said means including an electric element carried by each shuttle box and a magnetic element carried by the shuttle which operates in and out of the boxes, each said electric element being subject to energization by said magnetic element when the shuttle enters its box, an electric motor for operating the loom, a control switch for the a motor current, a movable lay arresting device, and an electronic system arranged to activate said control switch and arresting device, said system embodying an electron tube in operative association with each said electric element carried by the shuttle boxes and arranged to be fired when said electric element is energized, an additional electron tube in operative association with 12 said control switch and arresting device, said additional tube being arranged to be fired when either of the other tubes fails to be fired, and means for resetting the said system following loom stoppage by extinguishing said additional tube and firing said first named tubes.

19. In a loom, means for stopping the loom and arresting the forward lay motion when a shuttle fails properly to enter its box, said means including a pick-up coil carried by each shuttle box and a magnet carried by the shuttle which operates in and out of the boxes, each said coil being subject to energization by said magnet when the shuttle enters its box, an electric motor for operating the loom, a control switch for the motor current, a movable lay arresting device, and an electronic system arranged to activate said control switch and arresting device, said system embodying an electron tube in operative association with each said coil carried by the shuttle boxes and arranged to be fired when said coil is energized, an additional electron tube in operative association with said control switch and arresting device, said additional tube being arranged to be fired when either of the other tubes fails to be fired, and means for resetting the said system following loom stoppage by extinguishing said additional tube and firing said first named tubes.

20. In a loom lay and shuttle therefor for a loom dependent for continued operation upon impressing an electric impulse on an electronic circuit, an electric impulse generating unit carried by the lay and magnetic means carried by the shuttle effective when passing said unit to generate an electric impulse.

ARTHUR R. ABBOTT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 905,131 Bacon Dec. 1, 1908 1,080,091 Wintermayr Dec. 2, 1913 1,760,970 Wakefield June 3, 1930 2,410,687 Sepavich Nov. 5, 1946 

